Epiroc Minetruck MT66 S eDrive at Granny Smith: trial insights for mine planners
Reviewed by Joe Ashwell

First reported on International Mining – News
30 Second Briefing
Epiroc’s 66 t Minetruck MT66 S eDrive has begun a six‑month performance trial at Gold Fields’ Granny Smith mine, hauling ore at the Wallaby underground operation in Western Australia’s Laverton District. The diesel-electric truck is being benchmarked in Granny Smith’s existing truck fleet under real production conditions, with Epiroc specialists stationed on site for the full trial period. Outcomes will focus on fuel burn, cycle times and maintenance behaviour in deep-level, long‑haul stoping, informing future fleet replacement and electrification strategies.
Technical Brief
- Diesel-electric drivetrain allows mechanical decoupling of engine and wheel torque delivery.
- Electric traction is expected to reduce geartrain shock loads on declines and switchbacks.
- Onboard power electronics manage engine loading, targeting lower specific fuel consumption per tonne‑km.
- Regenerative braking potential on long downhill hauls could reduce service brake wear and heat load.
- Epiroc specialists embedded on site will fine‑tune duty cycles, operator settings and maintenance intervals.
- Trial data will inform compatibility with existing underground infrastructure, including ramp gradients and turning bays.
- Outcomes may guide other deep, long‑haul mining operations considering diesel‑electric transition before full BEV adoption.
Our Take
Within our 433 Mining stories, relatively few gold operations in Western Australia are trialling 60 t‑plus underground trucks, so a 66 t eDrive unit at Granny Smith signals that large‑scale electrified haulage is moving beyond early adopters in Canada and Scandinavia.
Epiroc’s recent product coverage in our database – from the COPROD 89 drilling system to long‑running Pit Viper rigs – shows the company pushing higher‑capacity, lower‑fuel‑burn equipment, and the MT66 S eDrive trial fits that pattern of targeting energy efficiency rather than just swapping diesel for battery power.
For Gold Fields’ Granny Smith and Wallaby orebodies, a six‑month performance trial at this payload class is long enough to generate real data on power‑draw profiles and heat rejection in deep stopes, which will materially influence future ventilation and electrical reticulation designs if they scale up eDrive fleets across the eastern Goldfields.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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